TSH345

TSH345 Triple video buffer with selectable filter for HD and SD video applications Features ■ Selectable 6th order filtering of 36 MHz, 18 MHz and 9 MHz ■ 5 V single-supply operation ■ Internal input DC level shifter ■ No input capacitor required ■ 3 matched 6 dB amplifiers ■ AC or DC output-coupled ■ Very low harmonic distortion ■ Specified for 150 Ω loads ■ Data min. and max. are tested during production Applications ■ High-end video systems ■ High definition TV (HDTV) ■ Broadcast and graphic video ■ Multimedia products Description The TSH345 is a triple single-supply video buffer featuring an internal gain of 6 dB and selectable filtering for HD and SD video outputs on 75 Ω video lines. The TSH345 is ideal to drive YC, CVBS, YUV, YPbPr or RGB signals from video DAC outputs. The main advantage of this circuit is its input DC level shifter. It allows driving video signals on 75 Ω video lines without damaging the synchronization tip and without input or output capacitors when using a single 5 V power supply. The DC level shifter is internally fixed and optimized to keep the output video signals between low and high output rails in the best position for the greatest linearity. The TSH345 is available in SO-14 and TSSOP-14 plastic packages for optimum space saving. SO-14 TSSOP14 R1 in 1 R2 in 2 G1 in 3 G2 in 4 B1 in 5 B2 in 6 +VCC 7 MUX MUX MUX 36MHz 18MHz 9MHz LPF + 6dB 14 Fs0 13 Fs1 36MHz 18MHz 9MHz LPF + 6dB 12 R out 11 G out 36MHz 18MHz 9MHz LPF + 6dB DC Shi...